distutils import tests module from the source code, so we must force it to use the test suite from the absolute path because it will be the converted on in case of 2to3 otherwise we fall-back to the relative module. issue3211
distutils import tests module from the source code, so we must force it to use the test suite from the absolute path because it will be the converted on in case of 2to3 otherwise we fall-back to the relative module. issue3211